target/linux/generic/backport-5.15/718-v6.0-net-ethernet-mtk_eth_soc-check-max-allowed-value-in-.patch

   1 From 4253e6e2b795a18ab534adcd5c313d3fc4150975 Mon Sep 17 00:00:00 2001
   2 Message-Id: <4253e6e2b795a18ab534adcd5c313d3fc4150975.1662332102.git.lorenzo@kernel.org>
   3 In-Reply-To: <2a60545635c2705312299384f4e9fec2f2a3acd6.1662332102.git.lorenzo@kernel.org>
   4 References: <2a60545635c2705312299384f4e9fec2f2a3acd6.1662332102.git.lorenzo@kernel.org>
   5 From: Lorenzo Bianconi <lorenzo@kernel.org>
   6 Date: Mon, 5 Sep 2022 00:48:52 +0200
   7 Subject: [PATCH net-next 3/6] net: ethernet: mtk_eth_soc: check max allowed
   8  value in mtk_ppe_check_skb
   9
  10 Check theoretical OOB accesses in mtk_ppe_check_skb routine
  11
  12 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  13 ---
  14  drivers/net/ethernet/mediatek/mtk_ppe.h | 3 +++
  15  1 file changed, 3 insertions(+)
  16
  17 --- a/drivers/net/ethernet/mediatek/mtk_ppe.h
  18 +++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
  19 @@ -294,6 +294,9 @@ mtk_ppe_check_skb(struct mtk_ppe *ppe, s
  20         if (!ppe)
  21                 return;
  22
  23 +       if (hash > MTK_PPE_HASH_MASK)
  24 +               return;
  25 +
  26         now = (u16)jiffies;
  27         diff = now - ppe->foe_check_time[hash];
  28         if (diff < HZ / 10)